Despite recent major advances, the opacity remains a source of substantial uncertainty in the calculation of solar models, and hence of solar oscillation frequencies. Hence it is of substantial interest to investigate the sensitivity of solar structure to changes in the opacity. Furthermore, we may hope from the precise helioseismic inferences of solar structure to obtain information about poss...

purpose: to evaluate the effect of childhood corneal opacity on the anteroposterior length of the globe in adulthood. methods: twenty-three patients with significant unilateral corneal opacity which had developed before the age of 6 years and the normal fellow eyes (controls) were evaluated. a comprehensive ocular examination including measurement of anterioposterior length and anterior chamber...

The objective of this study was to determine the effect of vitamin C supplementation on reducing the size of corneal opacity resulting from infectious keratitis.The study included 82 patients (82 affected eyes), admitted for infectious keratitis from January 2009 to August 2013, who were followed for more than 3 months. Patients were divided into control, oral vitamin C (3 g/d), and intravenous...

In [1], [2], [3] Bryans et al define a security property known as opacity. In this paper, we investigate possible relationships between opacity and several existing definitions for information flow, namely noninterference [8], [9], non-inference [15], nondeducibility [20] and nonleakage [21]. We show that non-interference implies opacity, and that non-inference is equivalent to opacity. We also...

BACKGROUND Previous studies have found an association between cataract or lens opacity and increased risk of mortality. Further work on determining explanatory factors for this association is needed. OBJECTIVES To determine, in a population-based cohort of older persons, the 2-year risk of death associated with different types of lens opacities; whether an association of mortality and lens op...

We clarify the relationships between Guerraoui and Kapalka’s opacity correctness condition for Transactional Memory (TM) algorithms and the TMS1 and TMS2 conditions we have previously proposed. Using formal, machine checked simulation proofs constructed using the PVS theorem proving system, we have shown that all algorithms that satisfy opacity also satisfy TMS1, and that all algorithms that sa...

(a) Many stationary sources discharge visible emissions into the atmosphere, which are usually in the shape of a plume. The following method describes a technical approach for determining the visible opacity of plume emissions through the use of photographs taken of the regulated source under compliance enforcement conditions. The photographs are processed using computer software that determine...

The most studied property, secrecy, is not always sufficient to prove the security of a protocol. Other properties such as anonymity, privacy or opacity could be useful. Here, we use a simple definition of opacity which works by looking at the possible traces of the protocol using a new property over messages called similarity. The opacity property becomes a logical constraint involving both si...

U.S. Environmental Protection Agency (USEPA) established Method 9 as a standard method to quantify plume opacity. However, there are issues about the subjectivity of such method . The appearance of the plume to human observations can be affected by many factors, such as the angle of the sun, the time of the day and the geographic location of the source . A new digital photographic method, Digit...

The United States Environmental Protection Agency (USEPA) developed Method 9 to describe how plume opacity can be quantified by humans. However, use of observations by humans introduces subjectivity, and is expensive due to semiannual certification requirements of the observers. The Digital Opacity Method (DOM) was developed to quantify plume opacity at lower cost, with improved objectivity, an...